Sheave-block.



J1'T' Johfi.son 12 BY 0 J. T; JOHNSON; SHEA'VB BLOCK. APPLIUATIOH FILED APB. 1 2, 1910.

984,141 Patented Feb.14,1911.

WITNESSES [NVE/VTQR 1 To all whom it may concern: 7

casing adapted to UNIT D STATES JAMES '1. JOHNSON, F TENINU, WASHINGTON.

PATENT; OFFICE.

sHEAvE-BLocx.

' Be it known that I, JA1\1'ns T. Johnson, a citizen of the United States, residing at Tenino, in the county of Thurston and State of Washington, have invented certain new and useful. Improvements in Sheaves-Blocks; and I do hereby declare the following to be a tulh rlczn', and exact description of the invention, such as will enable others skilled in the art to which it appertains to make My invention relates to new and useful improvements in sheave blocks and more particularly of that class adapted to be used torloggiug purposes and other places where heavy object-s areheing dragged or lifted by means of a cable and my object is to provide a twomrt casing and form a hub upon one project through the opposite casing. s.

' A further object is to provide means for locking-the casings 'together.

A further object is to provide an oil chain.

her within the huh. I

'.A further object is to provide asheare and position the samebetiveen the parts of the casing, and,

A further object to provide means tor bringing the parts of the casing together atthe point of greatest strain.

Other objects and advantages will behereinatter referred to and 'more particularly pointed out in the specification and claims. In the accompanying drawings which are made a part of this application,-Figure 1 is a side elevation of the sheaveblock in its assembled position. Fig. 2 is 5. sectional View thereof as seenon line 22 Fig. 1. Fig. 3 is a side elevation of the sheave show- ,ing the parts of the casing separated to 1.e cei-ve' the cable between the sections of the casing. and, Fig. 4 is a side elevation ota slightly modified forn'r of easing.

Referring-to the drawings in which similar reference numeralsdesignate corresponding parts throuisrhoutthe several Views, 1 and 2 indicate the two sections of the casing,

.which sections terminate at one point in cars Band 4, which ears are provided with alining openings 5, through which any suitable forth of anchoring means may he applied. The bodics of the sections 1 and 2 are substantially circular in general outline to conform to the periphery of a sheave 6. which is adapted to fitbetween the'sections of the casing. The

' ears 3 and 4: are adapted to rest against each 1 Specification of Letters Patent. Application filed April 12, 1910. Serial No. 555,078.

Patented Feb. 14, 191E.

- other when the casing is in its-assembled positlo'n, whlle between the ears and the sections are provided curved portions-'7 and 8, v

which when brought into registration with each other form a socket 9, through which a; Icahle passes when cooperating with the sheave.

The casing 1 is provided with a hub which extends laterally from said section and passes through an opening in the section 2 and projects a distance beyondthe section 2. That port-ion of the hub extendin through the sect1on'2 is'preferably reduced in diameter to form a shoulder 11,-against which the section 2 abuts. thereby limiting the in ward movement of said section and the section 2 is held in'- position-on the hub by providingthreads 12 on the periphery of the extended end of the hub. with which entlrreads on the interior of acap 13 and when said cap is turned on to'the hub, the;

inner end thereof forms ajam nut for the section 2 to lioldsaid section in firm cngagement with the shoulder.

to hold the cap securely l on the hub. I r -,l v I If desired, bearing rollerc? 17 may be introduced between te hub an the sheave, or if preferred. heari g balls ma -be used, there- 'by reducing the-friction bet lveen the sheave and: the hub. "J

Tn introducing the rope dr cablefirito engagement with the groove 18 in thesheave, the ears 3 and t are swung in opposite diree tions until they are separated, as showri in Fig. 3. when the cable can be readily introduced into engagementwith thesheave and the two ears again brought into'registration with each other. This operation willresult in closing that portion of the cable located between the! sheave and the car's, so that it will be impossible to the cable to become in position entangled or run ofl' of the sheave and it will further be seen; 'hat by arranging the twisted, which would result in fouling the betwein, said cas iiig having the faces bulged .the same to bind upon the sheave, as is comiwith the endot the hub and forming the hub be seen that by forming -the;;hub hollow and be seen that the cable or-rope can be quickly cars in this manner, the usual form of hooks, clevises and the like 'for anchoring the sheave block will be-dispensed with. it will. likewise be seen'that by anchoring the sheave block by means of the ears, the walls ofthe casing will not be sprunginwardly to cause mon in blocks anchored by clevises, rings and the like. I 1

In Fig. 4 of the drawings, the casing is provided. with a pair of ears 19 and 20, which are spaced. .a'distance apart and arranged to receive an anchoring cable 21, which anchoringcab le extends around a post 22 or other suitable anchoring means. This form of casing is primarily adapted for logging pun poses andwhen sensed, the sheave block is anchored to a stump or tree or .other suitable object and it will be readily seen that by spacing the ears apart, as shown, it will be impossible for the anchoring cable to become cable with the sheave when the cable is slack. This'manner of anchoring the block will" always resultin positioning the block right side up when a pullis made on the cable.

It will thus be seen that I have provided a very strong and durable form of sheave block and one that can be cheaply constructed and readily assembled together. It will further be seen that by anchoring the sheave block in the manner shown, the major por tion of-the strain thereon will result at the strongest portion of the block. It will likewise be seen that the block will be held. against twisting action when properly anchored and especially so where the block is provided with two sets of ears. It will Efu-rther be seen that by engaging the cap integral with one section of the casing, the parts of the block'will be securely held in their assembled positions and it will likewise providing the ports through the walls there of, the wearing parts of the sheave will be thoroughly lubricated at all times by placing alubric'ant in the hub. It will further en aged with the sheave block even though bo h ends ojtjthe cable be attached to an ob- 'ect. J What I claimis:

1. In a sheave block, a two-part casing, means to retain said parts in space'drelation to one another anti a sheave mounted there one another.

tion, saidhub having a cavity therein and at the upper portions thereof to :t'orun a socket and brought into registration with 2. In a sheave block, the combination with a casing formed in two sections, one of said sections having an integral hub thereon and the opposite section having an opening to receive the hub, said hub being hollow and 6 having a shoulder, against which the section surrounding the hub rests, a cap adapted to fit over the open end of the hub, a screw ex-- tending throughthe cap and hub to lock the cap in position, a sheave rotatably mounted on the hub and between the sections, said sections having-curved-portions to form a socket, said curved portions terminating in ears, through which are formed openings to receive an anchoringmeans.

3. In .a sheave block, the combination with a casing formed of two'sections, one section having an integral hub, over the end of which is adapted to take the opposite secports through the wall of the hub, a cap threaded on to the end of said hub, a screw extending through the cap and hub to lock the-cap in position, the edges of said sections havp ig curved portions to form asocket curved portions terminating in registering ears, a sheavev rotatably mounted on said hub and between said sections and bearing rollers between the'sheaver'tnd hub.

4. A sheave block, comprising a two part casing, the parts being held in spaced relation with one another and a sheave mounted therebetween,'the faces of said casing being bulgedCoutnardly adjacent theupper ortions thereof to form a socket, said b'u ged portions terminating in cars adapted to register with one another for anchoring pur poses. I

5. A sheave block, comprising a two-part casing, means to hold the parts in spaced relation with one another, a sheave mounted 'therebetween, the faces of. said casing being .bul ed outwardly tldJfiCBIltillGlI upper ends,

sai bulged portions cooperating withsaid sheave to foima socket for a cable, and

means to anchor said block.

In testimony whereof I have signed name to this specification in the presenceot' two subscribing witnesses.

' JAMES T. JOHNSON. Witnesses;

' L.G.WIonnRs A1\r,

P. C. Kinnn.

when the sections are brought together, said int 

